Malicious PDF — malware analysis report

Static analysis result for SHA-256 506f45fe2b00a93a…

MALICIOUS

PDF

69.9 KB Created: 2021-01-21 15:31:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c017bfc3223fc3e3ab6c6d22d30d14a4 SHA-1: b2b1422f235ac52ad65f0c7743332a6b7013c177 SHA-256: 506f45fe2b00a93a31805ec4713ef7ba3ec96bf7acac2f9dfd613988087908ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document body, though heavily obfuscated, suggests a lure related to a 'Probation form 48'. The presence of numerous embedded external links, including one pointing to 'traffset.ru', strongly suggests an attempt to redirect users to malicious websites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/aws?utm_term=probation+form+48 PDF link annotation
    • https://cdn.sqhk.co/solumapidema/Few6ghh/police_scanner_free_apk.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/vumugalofum.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/cfjiq3L/tamovanunibuliwaxuxar.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/6943109.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/ijghgih/granny_s_kitchen_menu_prices.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/6960137.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/45c98d86ef48.pdfIn PDF document text
    • http://buvemalo.66ghz.com/between_the_sheets_linen_spray.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikawin.rf.gd/37153146172.pdfIn PDF document text
    • http://fuxufotab.epizy.com/spreadsheet_software_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/xibuwanukesagufenemefo.pdfIn PDF document text
    • http://nototen.epizy.com/fukofapel.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/24699591320.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/77282397937.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/1048229688.pdfIn PDF document text
    • http://pufupivati.epizy.com/81590881987.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/rumon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 5124 bytes
SHA-256: eb7b0b4fec88df366fca80e8c5993db06602b316f4073c668a0c922a4bc3b274
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10244 bytes
SHA-256: 2d3fb400e487347dc224c2a500d381cdefbf240f50abda38adb381b294f70ab8

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